We’re being asked to indicate the half-reactions occurring at the anode.

2 Li_(s) + Ag₂CrO_4(s)  →  Li₂CrO_4(s) + 2 Ag_(s)

We’ll identify the anode and cathode half-reactions using the following steps.

Step 1. Separate the overall reaction into two half-reactions
Step 2. Separate the compound to ions
Step 4. Determine the oxidation half-reaction and the reduction half-reaction. 
Step 5. Identify the anode and cathode half-reaction.

Step 1. Separate the overall reaction into two half-reactions